Adaptive voltage curve not responding

[steffeeh]

You see my build in my sig

 

So I've made a decent overclock/overvolt profile that runs stable, which I first made in AI Suite 3 just to save some time from rebooting back forth from BIOS. For this overclock I decided to go with an adaptive voltage curve to save some heat when I'm just browsing the internet and such, and AI Suite 3 responded as it should to this, giving me a good range of lower voltages when the highest one wasn't necessary.

 

However once I moved the overclock settings into BIOS to get the best stability possible, things didn't go that well anymore. Now my voltage suddenly is fixed at a constant maximum value, and only drops down 16 mV every now and then - which isn't what I want.

What did I do wrong? I did select the adaptive mode in the AI Tweaker in BIOS and manually set both the overvolt values as well as the overvolt offset.

[steffeeh]

UPDATE: I've made sure the Intel SpeedStep and the C-stages are all active in BIOS, which they were.